in 4.9.4 a lot of my images align left when they are supposed to align center

[ConsiderThis1]

​https://health-boundaries.com/fingernails-2/
The captions on my images align centered, but the images themselves align left. They were inserted to align centered. Some images align properly. I don't know why the others won't. They were fine before I changed to the new version 4.9.4. Could it be because I didn't use 4.9.3 first?
Karen Kline

[SergeyBiryukov]

Hi @ConsiderThis1, welcome to WordPress Trac! Thanks for the report.

The images should align correctly if you add these styles in Appearance → Customize → Additional CSS:

.wp-caption img[class*="wp-image-"] {
	display: block;
	margin-left: auto;
	margin-right: auto;
}

It doesn't look the issue was caused by the upgrade, but rather by these styles missing in your theme. This Trac is used for enhancements and bug reporting for the WordPress core software, please try the ​support forums if you need any further help with your site.